Permutit Co
Permutit CActive Patents
0
Total Holdings
12
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2677390A | Diaphragm valve | Expired / Lapsed | 1949-03-03 | 1954-05-04 | 0 | Details |
| US2643771A | Liquid treatment device | Expired / Lapsed | 1950-02-18 | 1953-06-30 | 0 | Details |
| US2628194A | Process of and apparatus for regenerating ion exchangers | Expired / Lapsed | 1950-12-28 | 1953-02-10 | 2 | Details |
| US2562699A | Filter and method of backwashing same | Expired / Lapsed | 1949-06-17 | 1951-07-31 | 0 | Details |
| US2562730A | Filter tube | Expired / Lapsed | 1949-06-17 | 1951-07-31 | 0 | Details |
| US2535181A | Turbidity detector | Expired / Lapsed | 1947-07-21 | 1950-12-26 | 0 | Details |
| US2469472A | Cation exchange materials | Expired / Lapsed | 1944-03-15 | 1949-05-10 | 0 | Details |
| US2323990A | Process for carrying out anion exchange reactions | Expired / Lapsed | 1941-05-13 | 1943-07-13 | 0 | Details |
| US2267841A | Method of and apparatus for treating water | Expired / Lapsed | 1940-06-14 | 1941-12-30 | 0 | Details |
| US2076322A | Water filter battery control | Expired / Lapsed | 1936-01-02 | 1937-04-06 | 0 | Details |
| US2076321A | Plural valve actuation and control | Expired / Lapsed | 1935-10-15 | 1937-04-06 | 0 | Details |
| US1977781A | Dispensing apparatus | Expired / Lapsed | 1934-02-05 | 1934-10-23 | 0 | Details |